/*
 *
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */
package org.apache.metron.statistics.sampling;

import com.google.common.collect.Iterables;

import java.util.Optional;

public enum SamplerUtil {
  INSTANCE;

  public Sampler merge(Iterable<Sampler> samplers, Optional<Sampler> baseSampler) {
    if(Iterables.isEmpty(samplers)) {
      return null;
    }
    Sampler ret = baseSampler.orElse(Iterables.getFirst(samplers, null).cloneEmpty());
    for(Sampler s : samplers) {
      ret.addAll(s.get());
    }
    return ret;
  }
}
